in n difficulties 处境困难
The N-layer platform structure is presented and discussed in detail, especially the key design pattern, some difficulties and the technical implementation method.
本文还重点介绍了该平台的N层体系架构，特别对其中的难点和关键的设计思想，及其实现的技术路线进行了详细的探讨和说明。
Match 'N' Spell Game is composed of 8 individual jigsaw puzzles of varying difficulties.
串字拼写是由不同难度等级的8张拼图卡组成。
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